1. an ejaculatory utterance to express exuberance.
2. boisterous convivial fun, e.g. sexual play or relations, used frequently when old people fuck.
3. a named cushion that makes a sound like a fart when sat upon.
4. the base unit of stink olfaction. One whoopi is roughly equal to 300 times the smell of dead skunk, or 183 hobo units. Likened to old wet hairy burning ass, it has been described as the smell of Whoopi Goldberg herself on a humid August day.